Intangible Assets - Schedule Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 756	$ 292
Accumulated Amortization	(59)	(5)
Total	697	287
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	700	250
Accumulated Amortization	(50)	(4)
Total	650	246
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	56	42
Accumulated Amortization	(9)	(1)
Total	$ 47	$ 41